Super-Gaussian thermal effect of YVO4-Nd：YVO4 composite crystals
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摘要: 为了研究方形复合激光晶体YVO4-Nd:YVO4在超高斯抽运光分布下的热效应,采用半解析的分析方法进行了理论分析和实验验证。当使用输出功率为15W的半导体激光器端面中心入射、超高斯阶次为2时,在抽运端面中心获得175.4℃的最高温升和1.97μm的最大热形变量。结果表明,超高斯模型有更广泛的适用性,复合晶体可以有效地降低晶体中最高温升,但是不能明显减少晶体端面热形变。这一结果对解决激光系统热问题是有帮助的。Abstract: Based on semi-analytical theory,thermal effect of rectangle YVO4-Nd: YVO4 composite crystal end-pumped by the diode laser with super-Gaussian mode was studied through academic analysis and experimental validation.When the output power of diode laser was 15W and the order of the super-Gaussian beam was 2, in the center of the pump-lace of neodymium-doped YVO4-Nd: YVO4 composite crystal, the maximum temperature rise and thermal distortion got up to 175.4℃, 1.97μm respectively.The results show that super-Gaussian model is widely applieable and composite crystals can reduce the top temperature but can't reduce thermal distortion obviously.The result can offer theoretical basis for efficiently resolving the thermal problems in laser systems.
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